A)It is a website that sends messages to targeted users.
　　B)It makes money by putting on advertisements.
　　C)It profits by selling its users’ personal data.
　　D)It provides loads of information to its users.
　　63.What does the author say about most Facebook users?
　　A)They are reluctant to give up their personal information.
　　B)They don’t know their personal data enriches Facebook.
　　C)They don’t identify themselves when using the website.
　　D)They care very little about their personal information.
　　64.Why does Facebook make changes to its rules according to Elliot Schrage?
　　A)To render better service to its users.
　　B)To conform to the Federal guidelines.
　　C)To improve its users’ connectivity.
　　D)To expand its scope of business.
　　65.Why does Senator Charles Schumer advocate?
　　A)Setting guidelines for advertising on websites.
　　B)Banning the sharing of users’ personal information.
　　C)Formulating regulations for social-networking sites.
　　D)Removing ads from all social-networking sites.
　　66.Why does the author plan to cancel his Facebook account?
　　A)He is dissatisfied with its current service.
　　B)He finds many of its users untrustworthy.
　　C)He doesn’t want his personal data abused.
　　D)He is upset by its frequent rule changes.